iso-acc.el 17.3 KB
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;;; iso-acc.el --- minor mode providing electric accent keys
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;; Copyright (C) 1993, 1994, 1996, 2001 Free Software Foundation, Inc.
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;; Author: Johan Vromans
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;; Maintainer: FSF
;; Keywords: i18n
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;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
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;;; Commentary:

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;; Function `iso-accents-mode' activates a minor mode in which
;; typewriter "dead keys" are emulated.  The purpose of this emulation
;; is to provide a simple means for inserting accented characters
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;; according to the ISO-8859-1...3 character sets.
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;;
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;; In `iso-accents-mode', pseudo accent characters are used to
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;; introduce accented keys.  The pseudo-accent characters are:
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;;
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;;   '  (minute)    -> actue accent
;;   `  (backtick)  -> grave accent
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;;   "  (second)    -> diaeresis
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;;   ^  (caret)     -> circumflex
;;   ~  (tilde)     -> tilde over the character
;;   /  (slash)     -> slash through the character.
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;;                     Also:  /A is A-with-ring and /E is AE ligature.
;; These two are enabled only if you set iso-accents-enable
;; to include them:
;;   .  (period)    -> dot over the character (some languages only)
;;   ,  (cedilla)   -> cedilla under the character (some languages only)
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;;
;; The action taken depends on the key that follows the pseudo accent.
;; In general: 
;;
;;   pseudo-accent + appropriate letter -> accented letter
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;;   pseudo-accent + space -> pseudo-accent (except comma and period)
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;;   pseudo-accent + pseudo-accent -> accent (if available)
;;   pseudo-accent + other -> pseudo-accent + other
;;
;; If the pseudo-accent is followed by anything else than a 
;; self-insert-command, the dead-key code is terminated, the
;; pseudo-accent inserted 'as is' and the bell is rung to signal this.
;;
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;; Function `iso-accents-mode' can be used to enable the iso accents
;; minor mode, or disable it.
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;; If you want only some of these characters to serve as accents,
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;; add a language to `iso-languages' which specifies the accent characters
;; that you want, then select the language with `iso-accents-customize'.
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;;; Code:

(provide 'iso-acc)

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(defgroup iso-acc nil
  "Minor mode providing electric accent keys."
  :prefix "iso-accents-"
  :group 'i18n)

(defcustom iso-accents-insert-offset nonascii-insert-offset
  "*Offset added by ISO Accents mode to character codes 0200 and above."
  :type 'integer
  :group 'iso-acc)
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(defvar iso-languages
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  '(("catalan"
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     ;; Note this includes some extra characters used in Spanish,
     ;; on the idea that someone who uses Catalan is likely to use Spanish
     ;; as well.
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     (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
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	 (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
	 (?\  . ?'))
     (?` (?A . ?\300) (?E . ?\310) (?O . ?\322)
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	 (?a . ?\340) (?e . ?\350) (?o . ?\362)
	 (?\  . ?`))
     (?\" (?I . ?\317) (?U . ?\334) (?i . ?\357) (?u . ?\374)
	  (?\  . ?\"))
     (?~ (?C . ?\307) (?N . ?\321) (?c . ?\347) (?n . ?\361)
	 (?> . ?\273) (?< . ?\253) (?! . ?\241) (?? . ?\277)
	 (?\  . ?\~)))
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    ("esperanto"
     (?^ (?H . ?\246) (?J . ?\254) (?h . ?\266) (?j . ?\274) (?C . ?\306)
	 (?G . ?\330) (?S . ?\336) (?c . ?\346) (?g . ?\370) (?s . ?\376)
	 (?^ . ?^) (?\  . ?^))
     (?~ (?U . ?\335) (?u . ?\375) (?\  . ?~)))

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    ("french"
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     (?' (?E . ?\311) (?C . ?\307) (?e . ?\351) (?c . ?\347)
	 (?\  . ?'))
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     (?` (?A . ?\300) (?E . ?\310) (?U . ?\331)
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         (?a . ?\340) (?e . ?\350) (?u . ?\371)
	 (?\  . ?`))
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     (?^ (?A . ?\302) (?E . ?\312) (?I . ?\316) (?O . ?\324) (?U . ?\333)
	 (?a . ?\342) (?e . ?\352) (?i . ?\356) (?o . ?\364) (?u . ?\373)
	 (?\  . ?^))
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     (?\" (?E . ?\313) (?I . ?\317)  
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          (?e . ?\353) (?i . ?\357)
	  (?\  . ?\"))
     (?~ (?< . ?\253) (?> . ?\273) (?C . ?\307) (?c . ?\347)
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	 (?\  . ?~))
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     (?, (?C . ?\307) (?c . ?\347) (?\  . ?\,)))
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    ("german"
     (?\" (?A . ?\304) (?O . ?\326) (?U . ?\334)
	  (?a . ?\344) (?o . ?\366) (?u . ?\374) (?s . ?\337) (?\  . ?\")))

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    ("irish"
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     (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
	 (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
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	 (?\  . ?')))

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    ("portuguese"
     (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
	 (?C . ?\307) (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363)
	 (?u . ?\372) (?c . ?\347)
	 (?\  . ?'))
     (?` (?A . ?\300) (?a . ?\340)
	 (?\  . ?`))
     (?^ (?A . ?\302) (?E . ?\312) (?O . ?\324)
	 (?a . ?\342) (?e . ?\352) (?o . ?\364)
	 (?\  . ?^))
     (?\" (?U . ?\334) (?u . ?\374)
	  (?\  . ?\"))
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     (?~ (?A . ?\303) (?O . ?\325) (?a . ?\343) (?o . ?\365)
         (?C . ?\307) (?N . ?\321) (?c . ?\347) (?n . ?\361)
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	 (?\  . ?~))
     (?, (?c . ?\347) (?C . ?\307) (?, . ?,)))

    ("spanish"
     (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
	 (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
	 (?\  . ?'))
     (?\" (?U . ?\334) (?u . ?\374) (?\  . ?\"))
     (?\~ (?N . ?\321) (?n . ?\361) (?> . ?\273) (?< . ?\253) (?! . ?\241)
          (?? . ?\277) (?\  . ?\~)))

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    ("latin-1"
     (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
	 (?Y . ?\335) (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363)
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	 (?u . ?\372) (?y . ?\375) (?' . ?\264)
	 (?\  . ?'))      
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     (?` (?A . ?\300) (?E . ?\310) (?I . ?\314) (?O . ?\322) (?U . ?\331)
	 (?a . ?\340) (?e . ?\350) (?i . ?\354) (?o . ?\362) (?u . ?\371)
	 (?` . ?`) (?\  . ?`))
     (?^ (?A . ?\302) (?E . ?\312) (?I . ?\316) (?O . ?\324) (?U . ?\333)
	 (?a . ?\342) (?e . ?\352) (?i . ?\356) (?o . ?\364) (?u . ?\373)
	 (?^ . ?^) (?\  . ?^))
     (?\" (?A . ?\304) (?E . ?\313) (?I . ?\317) (?O . ?\326) (?U . ?\334)
	  (?a . ?\344) (?e . ?\353) (?i . ?\357) (?o . ?\366) (?s . ?\337)
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	  (?u . ?\374) (?y . ?\377)
	  (?\" . ?\250) (?\  . ?\"))
     (?~ (?A . ?\303) (?C . ?\307) (?D . ?\320) (?N . ?\321) (?O . ?\325)
	 (?T . ?\336) (?a . ?\343) (?c . ?\347) (?d . ?\360) (?n . ?\361)
	 (?o . ?\365) (?t . ?\376)
	 (?> . ?\273) (?< . ?\253) (?! . ?\241) (?? . ?\277)
	 (?\~ . ?\270) (?\  . ?~))
     (?/ (?A . ?\305) (?E . ?\306) (?O . ?\330) (?a . ?\345) (?e . ?\346)
	 (?o . ?\370)
	 (?/ . ?\260) (?\  . ?/)))
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    ("latin-2" latin-iso8859-2
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     (?' (?A . ?\301) (?C . ?\306) (?D . ?\320) (?E . ?\311) (?I . ?\315)
	 (?L . ?\305) (?N . ?\321) (?O . ?\323) (?R . ?\300) (?S . ?\246)
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	 (?U . ?\332) (?Y . ?\335) (?Z . ?\254)
	 (?a . ?\341) (?c . ?\346) (?d . ?\360) (?e . ?\351) (?i . ?\355)
	 (?l . ?\345) (?n . ?\361) (?o . ?\363) (?r . ?\340) (?s . ?\266)
	 (?u . ?\372) (?y . ?\375) (?z . ?\274)
	 (?' . ?\264) (?\  . ?')) 
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     (?` (?A . ?\241) (?C . ?\307) (?E . ?\312) (?L . ?\243) (?S . ?\252)
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	 (?T . ?\336) (?Z . ?\257)
	 (?a . ?\261) (?l . ?\263) (?c . ?\347) (?e . ?\352) (?s . ?\272)
	 (?t . ?\376) (?z . ?\277)
	 (?` . ?\252)
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	 (?. . ?\377) (?\  . ?`))
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     (?^ (?A . ?\302) (?I . ?\316) (?O . ?\324)
	 (?a . ?\342) (?i . ?\356) (?o . ?\364)
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	 (?^ . ?^)			; no special code?
	 (?\  . ?^))
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     (?\" (?A . ?\304) (?E . ?\313) (?O . ?\326) (?U . ?\334)
	  (?a . ?\344) (?e . ?\353) (?o . ?\366) (?s . ?\337) (?u . ?\374)
	  (?\" . ?\250)
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	  (?\  . ?\"))
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     (?~ (?A . ?\303) (?C . ?\310) (?D . ?\317) (?L . ?\245) (?N . ?\322)
	 (?O . ?\325) (?R . ?\330) (?S . ?\251) (?T . ?\253) (?U . ?\333)
	 (?Z . ?\256)
	 (?a . ?\343) (?c . ?\350) (?d . ?\357) (?l . ?\265) (?n . ?\362)
	 (?o . ?\365) (?r . ?\370) (?s . ?\271) (?t . ?\273) (?u . ?\373)
	 (?z . ?\276)
	 (?v . ?\242)			; v accent
	 (?\~ . ?\242)			; v accent
	 (?\. . ?\270)			; cedilla accent
	 (?\  . ?~)))
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    ("latin-3" latin-iso8859-3
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     (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
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	 (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
	 (?' . ?\264) (?\  . ?'))      
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     (?` (?A . ?\300) (?E . ?\310) (?I . ?\314) (?O . ?\322) (?U . ?\331)
	 (?a . ?\340) (?e . ?\350) (?i . ?\354) (?o . ?\362) (?u . ?\371)
	 (?` . ?`) (?\  . ?`))
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     (?^ (?A . ?\302) (?C . ?\306) (?E . ?\312) (?G . ?\330) (?H . ?\246)
	 (?I . ?\316) (?J . ?\254) (?O . ?\324) (?S . ?\336) (?U . ?\333)
	 (?a . ?\342) (?c . ?\346) (?e . ?\352) (?g . ?\370) (?h . ?\266)
	 (?i . ?\356) (?j . ?\274) (?o . ?\364) (?s . ?\376) (?u . ?\373)
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	 (?^ . ?^) (?\  . ?^))
     (?\" (?A . ?\304) (?E . ?\313) (?I . ?\317) (?O . ?\326) (?U . ?\334)
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	  (?a . ?\344) (?e . ?\353) (?i . ?\357) (?o . ?\366) (?u . ?\374)
	  (?s . ?\337)
	  (?\" . ?\250) (?\  . ?\"))
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     (?~ (?A . ?\303) (?C . ?\307) (?D . ?\320) (?N . ?\321) (?O . ?\325)
	 (?a . ?\343) (?c . ?\347) (?d . ?\360) (?n . ?\361) (?o . ?\365)
	 (?$ . ?\245) (?S . ?\252) (?s . ?\272) (?G . ?\253) (?g . ?\273)
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	 (?U . ?\335) (?u . ?\375) (?` . ?\242)
	 (?~ . ?\270) (?\  . ?~))
     (?/ (?C . ?\305) (?G . ?\325) (?H . ?\241) (?I . ?\251) (?Z . ?\257) 
	 (?c . ?\345) (?g . ?\365) (?h . ?\261) (?i . ?\271) (?z . ?\277)
	 (?r . ?\256)
	 (?. . ?\377) (?# . ?\243) (?$ . ?\244)
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	 (?/ . ?\260) (?\  . ?/))
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     (?. (?C . ?\305) (?G . ?\325) (?I . ?\251) (?Z . ?\257)
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 	 (?c . ?\345) (?g . ?\365) (?z . ?\277))))
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  "List of language-specific customizations for the ISO Accents mode.

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Each element of the list is of the form
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    (LANGUAGE [CHARSET]
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     (PSEUDO-ACCENT MAPPINGS)
     (PSEUDO-ACCENT MAPPINGS)
     ...)
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LANGUAGE is a string naming the language.
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CHARSET (which may be omitted) is the symbol name
 of the character set used in this language.
 If CHARSET is omitted, latin-iso8859-1 is the default.
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PSEUDO-ACCENT is a char specifying an accent key.
MAPPINGS are cons cells of the form (CHAR . ISO-CHAR).
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The net effect is that the key sequence PSEUDO-ACCENT CHAR is mapped
to ISO-CHAR on input.")
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(defvar iso-language nil
  "Language for which ISO Accents mode is currently customized.
Change it with the `iso-accents-customize' function.")

(defvar iso-accents-list nil
  "Association list for ISO accent combinations, for the chosen language.")
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(defcustom iso-accents-mode nil
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  "*Non-nil enables ISO Accents mode.
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Setting this variable makes it local to the current buffer.
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See the function `iso-accents-mode'."
  :type 'boolean
  :group 'iso-acc)
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(make-variable-buffer-local 'iso-accents-mode)
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(defcustom iso-accents-enable '(?' ?` ?^ ?\" ?~ ?/)
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  "*List of accent keys that become prefixes in ISO Accents mode.
The default is (?' ?` ?^ ?\" ?~ ?/), which contains all the supported
accent keys.  If you set this variable to a list in which some of those
characters are missing, the missing ones do not act as accents.

Note that if you specify a language with `iso-accents-customize',
that can also turn off certain prefixes (whichever ones are not needed in
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the language you choose)."
  :type '(repeat character)
  :group 'iso-acc)
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(defun iso-accents-accent-key (prompt)
  "Modify the following character by adding an accent to it."
  ;; Pick up the accent character.
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  (if (and iso-accents-mode
	   (memq last-input-char iso-accents-enable))
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      (iso-accents-compose prompt)
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    (vector last-input-char)))
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(defun iso-accents-compose (prompt)
  (let* ((first-char last-input-char)
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	 (list (assq first-char iso-accents-list))
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	 ;; Wait for the second key and look up the combination.
	 (second-char (if (or prompt
			      (not (eq (key-binding "a")
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				       'self-insert-command))
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			      ;; Not at start of a key sequence.
			      (> (length (this-single-command-keys)) 1)
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			      ;; Called from anything but the command loop.
			      this-command)
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			  (progn
			    (message "%s%c"
				     (or prompt "Compose with ")
				     first-char)
			    (read-event))
			(insert first-char)
			(prog1 (read-event)
			  (delete-region (1- (point)) (point)))))
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	 (entry (cdr (assq second-char list))))
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    (if entry
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	;; Found it: return the mapped char
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	(vector
	 (if (and enable-multibyte-characters
		  (>= entry ?\200))
	     (+ iso-accents-insert-offset entry)
	   entry))
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      ;; Otherwise, advance and schedule the second key for execution.
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      (push second-char unread-command-events)
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      (vector first-char))))

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;; It is a matter of taste if you want the minor mode indicated
;; in the mode line...
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;; If so, uncomment the next four lines.
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;; (or (assq 'iso-accents-mode minor-mode-alist)
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;;     (setq minor-mode-alist
;; 	  (append minor-mode-alist
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;; 		  '((iso-accents-mode " ISO-Acc")))))
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;;;###autoload
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(defun iso-accents-mode (&optional arg)
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  "Toggle ISO Accents mode, in which accents modify the following letter.
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This permits easy insertion of accented characters according to ISO-8859-1.
When Iso-accents mode is enabled, accent character keys
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\(`, ', \", ^, / and ~) do not self-insert; instead, they modify the following
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letter key so that it inserts an ISO accented letter.

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You can customize ISO Accents mode to a particular language
with the command `iso-accents-customize'.
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Special combinations: ~c gives a c with cedilla,
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~d gives an Icelandic eth (d with dash).
~t gives an Icelandic thorn.
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\"s gives German sharp s.
/a gives a with ring.
/e gives an a-e ligature.
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~< and ~> give guillemots.
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~! gives an inverted exclamation mark.
~? gives an inverted question mark.
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With an argument, a positive argument enables ISO Accents mode, 
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and a negative argument disables it."
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  (interactive "P")

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  (if (if arg
	  ;; Negative arg means switch it off.
	  (<= (prefix-numeric-value arg) 0)
	;; No arg means toggle.
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	iso-accents-mode)
      (setq iso-accents-mode nil)
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    ;; Enable electric accents.
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    (setq iso-accents-mode t)))
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(defun iso-accents-customize (language)
  "Customize the ISO accents machinery for a particular language.
It selects the customization based on the specifications in the
`iso-languages' variable."
  (interactive (list (completing-read "Language: " iso-languages nil t)))
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  (let ((table (cdr (assoc language iso-languages)))
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	all-accents tail)
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    (if (not table)
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	(error "Unknown language `%s'" language)
      (setq iso-accents-insert-offset (- (make-char (if (symbolp (car table))
							(car table)
						      'latin-iso8859-1))
					 128))
      (if (symbolp (car table))
	  (setq table (cdr table)))
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      (setq iso-language language
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	    iso-accents-list table)
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      (if key-translation-map
	  (substitute-key-definition
	   'iso-accents-accent-key nil key-translation-map)
	(setq key-translation-map (make-sparse-keymap)))
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      ;; Set up translations for all the characters that are used as
      ;; accent prefixes in this language.
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      (setq tail iso-accents-list)
      (while tail
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	(define-key key-translation-map (vector (car (car tail)))
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	  'iso-accents-accent-key)
	(setq tail (cdr tail))))))
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(defun iso-accentuate (start end)
  "Convert two-character sequences in region into accented characters.
Noninteractively, this operates on text from START to END.
This uses the same conversion that ISO Accents mode uses for type-in."
  (interactive "r")
  (save-excursion
    (save-restriction
      (narrow-to-region start end)
      (goto-char start)
      (forward-char 1)
      (let (entry)
	(while (< (point) end)
	  (if (and (memq (preceding-char) iso-accents-enable)
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		   (setq entry (cdr (assq (following-char) (assq (preceding-char) iso-accents-list)))))
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	      (progn
		(forward-char -1)
		(delete-char 2)
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		(insert entry)
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		(setq end (1- end)))
	    (forward-char 1)))))))

(defun iso-accent-rassoc-unit (value alist)
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  (let (elt acc)
    (while (and alist (not elt))
      (setq acc (car (car alist))
	    elt (car (rassq value (cdr (car alist))))
	    alist (cdr alist)))
    (if elt
	(cons acc elt))))
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(defun iso-unaccentuate (start end)
  "Convert accented characters in the region into two-character sequences.
Noninteractively, this operates on text from START to END.
This uses the opposite of the conversion done by ISO Accents mode for type-in."
  (interactive "r")
  (save-excursion
    (save-restriction
      (narrow-to-region start end)
      (goto-char start)
      (let (entry)
	(while (< (point) end)
	  (if (and (> (following-char) 127)
		   (setq entry (iso-accent-rassoc-unit (following-char)
						       iso-accents-list)))
	      (progn
		(delete-char 1)
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		(insert (car entry) (cdr entry))
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		(setq end (1+ end)))
	    (forward-char 1)))))))

(defun iso-deaccentuate (start end)
  "Convert accented characters in the region into unaccented characters.
Noninteractively, this operates on text from START to END."
  (interactive "r")
  (save-excursion
    (save-restriction
      (narrow-to-region start end)
      (goto-char start)
      (let (entry)
	(while (< (point) end)
	  (if (and (> (following-char) 127)
		   (setq entry (iso-accent-rassoc-unit (following-char)
						       iso-accents-list)))
	      (progn
		(delete-char 1)
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		(insert (cdr entry)))
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	    (forward-char 1)))))))

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;; Set up the default settings.
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(iso-accents-customize "latin-1")
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;; Use Iso-Accents mode in the minibuffer
;; if it was in use in the previous buffer.
(defun iso-acc-minibuf-setup ()
  (setq iso-accents-mode
	(save-excursion
	  (set-buffer (window-buffer minibuffer-scroll-window))
	  iso-accents-mode)))

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(add-hook 'minibuffer-setup-hook 'iso-acc-minibuf-setup)
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Richard M. Stallman committed
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;;; iso-acc.el ends here